Telephone system



TELEPHONE 5 Y5 TEM Filed Dec. 17 19 2 Sheets-Sheet 1 Q //7|/e/1f0/ (bar/es L. 600491.477

Jan. 8, 1924. 1,480,202

C. I... GOODRUM TELEPHONE SYSTEM Filed Dec. 1?, 1919 2 Sheets-Sheet 2 //1 ven for. (/rar/es L Good/"am.

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Patented Jan. 8, 1924.

UNITED STATES PATENT OFFICE.

CHARLES L. GOODRUM, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COM- PANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE SYSTEM.

Application filed December 17, 1919. Serial No. 345,499.

T 0 all whom it may concern-.-

Be it known that I, CHARLES L. oooimM, a citizen of the United States, residing at New york. in the county of New York, State of New York, have invented certain new and useful Improvements in Telephone Systems, of which the following is a full. clear, concise, and exact description.

This invention relates to machine switclr ing telephone systems and more particularly to a system in which all the switching operation are accomplished by means of relays and in which each operation is instantaneous, there being no time lost in trunk-hunting asall the trunks stand pie selected and ready for instant use.

In my copending upplication serial No. 519,857. filed December 5, 1921 which is a continuation of application Serial No. 340,566, filed November 25, 1919, I have disclosed a system provided with an arrangement of mechanical bars operated by megnets common to a group of lines. In this disclosure it was necessary to have at least one bar always in an actuated position in order to have a trunk preselected.

The present invention is an improvement over the arrangement disclosed in the aforesaid application, Serial No. 519,857 in that the number of relay and magnet windings per line is still further reduced, the system of mechanical bars is greatly simplified and the normal condition of the apparatus is one of rest.

The object then of the present invention is to provide a system in which the interconnection of lines is accomplished through the use of simple movement mechanisms all of which are normally at rest. By simple movement is meant single movement in one directionin extent something in the order of a fraction of an inch. Thus there is no step-by-step movement nor is there a movement over a distance more than sufiicient to establish a single connection.

In accordance with this invention there is provided a switching mechanism at the crossing point of each oup of lines and each group of transfer circuits. To actuate these switching mechanisms, there. is provided a set of bars, one individual to each group of lines for preparing the switching mechanisms for operation, and a set of bars. one individual to each group of transfer circuits for actuating those switching mechanisms which have been prepared for operation by said first-named bars. These last bars also function to hold the operated switching mechanisms in position during the existence of a connection.

Also in accordance with this invention. the normal condition of the apparatus is one of rest, no trunk bars being operated to preselect an idle trunk. This invention con template a system in which the first idle trunk is always preselected, though no movement of the apparatus associated therewith has been made.

Further, in accordance with this inven' tion, a magnet for operating the trunk bar has been provided having a plurality of armatures, one of which is quick to respond to the energization of the magnet and another of which is slow to respond to the energization of the magnet. The circuit for the 75 energization of this magnet is originally closed when call is initiated and is immediately broken by the quick-acting armature. However, a holding circuit is immediately established through the quick-acting armature and subsequently opened by the slowacting armature. In the meantime or in response to the energization of the magnet, a third circuit is established for holding the magnet energized and this circuit is closed between the time of the o eration of the quick-acting armature and 516 operation of the slow-acting armature. The 1 original circuit for the energization of this trunk bar magnet, after being opened by the quickacting armature, is subsequently closed by the slow-acting armature and extended to the magnet controlling the next trunk bar.

The drawings diagrammatically illustrate the preferred embodiment of the invention. Fig. 1 is a diagrammatic illustration of a small group of switching mechanisms to gether with the circuits for operating them; Fig. 2 is a perspective view of a sin le switching mechanism showing in detail 5m arrangement of the various bars for operating the same.

In Fig. 1 there is shown two grups of lines, the first group containing lines 1 and 2 and the second group containing lines 3 and 4. Crossing both of these groups of lines are two groups of transfer circuits, the first containing transfer circuits 5 and 6 and the second containing transfer circuits 7 and 8. There is a switching mechanism 9 at the crosing o t ofJJre ii'stgroup ol linesandithg first'griiiip of tra iisfrr circuits; :1 switching mechanism 10 at the crossing point of the first group of lines and the second 'rou oftransfer circuits; a switch ing mefihanisin' T1" at. the crossing point of the second group of lines and the F rst group of transfer circuits; a switching mechw nism 12 at the crossing point of the second group of lines and the second group of transfer circuits :Thefirst group ,of transfer circuits 5 and 6 are individual to a trunk 13 and the second group of transfer circuits TanrLS areindiyidualitoa trunk 14 Transfer circuit 5 isconnected to trunk i through a switching mechanism to; transfer circuitfi is connectedtothe trunk 1 through a switching mechanism L6; transfer circuit 7 is connected to the trunk l-{Lthrough itlzc switching mechanism 17, and transfer circuit 8;i s QODJ1Ct E ].tO; th tYl;lHk -14 through ,thje-rswitqhing mechanism l8.. Individual to the first group of lines 1 and 2. therc;is atbar w vhich preparestheiswitching ,meclr anis nsiti and. lflifor operation individual to the second.groupr oi hnesfi and th'ere is a harflfl which prepares theswitchilur mech .anis ns 1;1\ a.pdl2 .for operationaindividual ito the corresponding transfer .circuits and 1 there is ai-b'arr2ll ,-wh i,eh prepa r'cs'.the switch ingmcohani'sinsil ,wdLltfOiI operation, indiividuy lyto the corresponding transfer. circuits 6 imd B-there is aibar 22 which we pares switching {mechanisms lilond 18 for operation:- -Magnets E23. 324;--.Z5 and 26 are pro ided to actuateibars-ltlto'fi inclusive. respectively. n;

Assuming ,that ,magnets,23 and 26 have been;-ar.t1iatedand .-,tha.t switching mecha n sms 9, M), M an 8-11mm been p em x for 'operation,-. then: either: trunk :bar 27. or 28, ,upon'beingi' operated, through. the Operation 101. magnets-29 or. 30, would cause the actuation-of wswitchingmechariismsiQ and 16 0x10 and 118,; ,whereupon the calling linesin theflfirst group .will befswitched to either .trunk 13 9;: I4; I a v 1 We mill;assnme=-that' linc 'No. 1 initiates a Thereupon the line-rela 31 will bQBIIergizQgLin the usual manner and upon ,attracting-itsarmature.will place a ground on conductors ,32 and 33; Ground placed on .condpctor- 32 will cause the energization of magpet 23, and ground placed on conductor 33 will causethe energizationof magnet 26 thereupon harsnlfi and 22 will become operated and lift the latches 34; and 35 assoc atedwith bar 19,vand latches 36 and 3? asso- .ciated with bar22. :The operation ofmar-- nets 23 and 26 also establishes a connection from ground, the contact and armature of magnet 26, conductor .38 and contact and armature magnet 23, conductor 39, contact 4;) controlled by magnet 30, winding of nagnetgfl to battery and ground, Magma:

.tor

K :ictuatcslhe char 28.whereupon the luthcs A and 36 come into engagement with the arms 41 and 42 of switching mechanisms Ill and 15 respectively and cause the actuation of switching mechanisms l0 and 1S. liir mcdiately upon the actuation of magnet 30.

the contact is opened but magnet 30 is held energized through a connection from ground, contact 43,,armature 44 contact 45 and the winding; of magruct 30 The armature'46 is put under a tension by the spring 'lT and does not immcdiatel qmovc into its actuated position due ,to the retardation caused by the dash pot 48.

As soon as the switching mechanisms 10 and i8 are actuated, line .l is extended through the middle ,set of three armaturcs and contacts ,of switchin; mechanism l0. over the transfer.circuit 8, thiougli,the contacts and armatures .of switching anechnnisur 18 to the trunk 14. Thereupon and in accordance .with well-known practice. a ground will be placed on the thirdconducat circuit-is .now closed from this ground through .the third monducton con' tacts and armatures .oJE Switching mechanisms 1.8 and 10. to contact and thence through the winding of cut-off relay 51 to battery and ground; Relay 51 attracts its ii -matures and causes the deener zization 01 line relay 31 whereupon magnets 23 and 26 are cleenergized when the bars 19 and 22 return under the influence of springs such as 52. to their normal positions. Shortly after the bars 19 and 22 have returned to their normal positions, the armature 46 moves into its actuated position whereupon the groundiof conductor 49 ordinarily pro ,vided through the Contact 43: is removed, and

the conductor .39 is extended through the .contact 53 to conductor 54 'ivh'ereby the mag- .net 29 ismade available, forlhe .nextincomingcall. Y i

During the existence of the connection; the ground on conductor 49.ho'lds magnet ,3D'foperated whereby the bar 28 .is continuously operated andzbhe switchingmechanisms 10 and-1S are held in their actuated positions.

V-When the conversational period is over ancltlie callincsubjscriber placesfthe receiver Quits-hook in accordance with my previously .filed invcntion ,-the ground 18 removed from Lil] subgroup to which substations 1 and 2 belong. At its outer armature contact, line relay 55 establishes a circuit for magnet 25. In the manner previously described magnets 23 and 25 become energized, magnet 23 lifting latch 35 and magnet 25 lifting latch 56. Latches 34. and 36 are not moved out of their operated positions at this time since they are locked in the notches in the arms 2i and 42 by the operated bar 28 Upon the energization of magnets 25 and 23 a circuit is established for the magnet 29 associated with bar 27 individual to the next idle trunk 13 which may be traced from ground at the armature contact of magnet 25,,conductor 38, the armature contact of magnet 23, conductor 39, contact 53, conductor 54, contacts 40 and 45, to battery through the Winding of magnet 29. Magnet 29 operates bar 27 whereupon the latches 35 and 56 come into engagement with the arms 57 and 58 of switching mechanisms 9 and 15, respectively and cause their operation. A connection is now extended from the substation 2- to the trunk 13 and magnets 23 and 25 thereupon become deenergized, the established connection being maintained by the continued energization of magnet 29, this magnet being locked over conductor 59. In this manner magnet 23 may be repeatedly operated to serve in the establishment of a plurality of coexisting connections.

What is claimedis: 1

1. In a telephone system, groups of lines, groups of transfer circuits, a switching mechanism at the crossing point of each roup of lines and group of transfer circuits or connecting said lines to said transfer circuits, a trunk line associated with each group of transfer circuits, a switching mechanism individual to each transfer circuit for connecting said transfer circuit to said trunk, a bar individual to each ,group of lines for preparing the switching mechanisms associated therewith for operation, a bar individual to each transfer circuit of a group and common to the corresponding transfer circuits of each group for preparing the switching mechanisms associated therewith for operation, and a bar individual to each group of transfer circuits for actuating the prepared switching mechanism.

2. In a telephone system. groups of lines. groups of transfer circuits, a switching mechanism at the crossing point of each group of lines and group of transfer circuits for connecting said lines to said transfer circuits, a trunk line associated with each group of transfer circuits, a switching mechanism individual to each transfer circuit for connecting said transfer circuit to said trunk, a bar individual to each group of lines for preparing the switching mechanisms associated therewith for operation,

a bar individual to each transfer circuit of a group and common to the corresponding transfer circuits of each group for preparing the switching mechanism associated therewith for operation, a bar individual to each group of transfer circuits for actuating the prepared switching mechanisms, and magnets for operating said bars.

3. In a telephone system, groups of lines, groups of transfer circuits, a switching mechanism at the crossing point of'each group of lines and group of transfer circuits for connecting said lines to said transfer circuits, a trunk line associated with each group of transfer circuits, a switching mechanism individual to each transfer circuit for connecting said transfer circuit to said trunk, a bar individual to each group of lines for preparing the switching mechanisms associated therewith for operation,-a bar individual to each transfer circuit of a group and common to the corresponding transfer circuits of each group for preparing the switching mechanisms associated therewith for operation, a bar individual to each group of transfer circuits for actuating the prepared switching mechanism, said last named bar being arranged to lock said actuated switching mechanisms in position;

4. In a telephone system, groups of lines, groups of transfer circuits, a switching mechanism at the crossing point of; each group of lines and group of transfer circuits for connecting said lines to said transfer circuits, a trunk line associated with each a group of transfer circuits, 2, switching mechanism individual to each transfer circuit for connecting said. transfer circuit to said trunk, a bar individual to each groupof lines for preparing the switchingpm'echanisms associated therewith for operation, a bar individual to each transfer circuit ofa group and common to the corresponding transfer circuit of each group for prepariml the switching mechanisms associated therewith for operation, a bar individual to each group of transfer circuits for actuating the prepared switching mechanism, means for operating said preparing bars, means for operating said actuating bars, and means responsive to the actuation of said last-named bars for releasing said first-named bars.

5. In a telephone system, groups of lines, groups of transfer circuits, a switching mechanism at the crossing point of each group of lines-and group of transfer circuits for connecting said lines to said transfer circuits, a trunk line associated with each group of transfer circuits, a switching mechanism individual to each transfer circuit for connecting said transfer circuit to said trunk, a bar individual to each group of lines for preparing the switching mechanisms associated therewith for operation, a-

bar individual to each transfer circuitof a group and common to the corresponding transfer circuits of each group for preparing: the switching mechanisms associated there with for operation, a her individual to each group 05' transfer circuils for actuating the prepared switching mechanism, means under control of a line of one of said groups for operating the her individual to that group of lincs,'a nd for operiiting a particular one of said bars individual to said trans fer circuits. and means under the control of said operated bars for operating one of said bars individual to a group of transfer circuits whereby said line is connected to the trunk corresponding to the group of transfei circuits included in the said connection.

6. ln a telephone system. groups of lines groups of transfer circuits, :1 switching mechanism at the crossing, point of each groiipof lines and group of transfer circuits for connecting said lines to said transfer circuits a trunlr line associated with each group of transfer circuits a switching mechanism individual to each trahsfer circuit for connecting said transfer circuit to sa id't'luli'lifzvba'r individual to each group'of lime phiali'hfg the sititchin ech'anisms assotiia ed therewith for operation! a bar individual to each transfer circuit of a ro p and common to the corres ondin trali sfer circuits of each g oup forpr'e' ari'ng the switching mechanisms associated therewith for operation, a bar individual to each group of transfer circuits for actuating the i iird switching mechanism, means under control of a li'ne of one of said'g'roups for operating the bar individual to that group'of lines, and s emmin a articulaione of said-bars individual to sai transfer circuits; andmeshs under the control of said operated bars for operating one of said bars individual to a grou "of transfer circuits whereby said lineis connected to the trunk corresponding to thegroup of transfercirc uits included in the aid connection. and means under control of said last operated bar for releasing said'firs't operated bars;

7."In a telephone system, a group of trunks; a ma'gnet individual to each trunk for controlling thejorifxectidns of lines to said trunk, said magnet being provided with a'plura'lity arm-mat res one ui'clily i-e'sponsive to the nergization of 'd magnet and another slowly responsive to the energize uon' of Said magnet, and a circuit for the en; ergiiltion of said magnet closed by said quick-acting armature and siibsequntly opened by said slow-acting armature.

8. In a telephone systelr'i, a group of trunks; a magne iri di'jvi'dual to each 't-ru'nlc' focciiiit rollifn' the seiner-ion of saidtrunk, said magnet being provided with a plurality of armatures one uickly responsive to the nergizltioh (if said miiiguet' and another slowly responsive to the energization of said magnet, a circuit closed upon the selection o l' the trunk for energizing the magnet 01 the first of said trunks, Said circuit being broken by said quick-acting armature, a lllll[llll:,'1'(licuil'. for said magnet being thereupon closed by said quick-acting armature and subsequently opened by said slow-acting armature, a third circuit for holding said magnet energized and means for closing said third cireuit responsive to the energization of said magnet.

9. In a telephone system, a group of trunks, a magnet individual to each trunk for controlling the selection thereof, said magnet being provided with a plurality of armatures one quickly responsive to the energization of said magnet and another slowly responsive to the energization of said magnet, a circuit closed upon the selection of a trunk for energizing the magnet of the first idle one of said trunks, said circuit bem opened by said quick-acting armature and subsequently closed by said slowacting armature; said circuit being thereby extended to the next idle trunk. 10. In a, telephone system a group of trunks, a magnet individual to each of said thinks for controlling the selection thereof, said magnet being provided with a plurality of arrhatures; on'e quickly responsive to the energization of said magnet, and another slowly responsive to the energization of said magnet, a circuit closed upon the selection of a trunk for energizing the magnet of the first idle one of said trunks, said circuit being thereupon broken by said quick-acting armature and subsequently extended by said slow-acting armature to the" next idle'oiie of said trunks, and means for opening said circuit after said quick-acting armature has operated and before said slow-acting armature has operated.

'11. In a telephone system, telephone lines, a group of trunks to which said lines may be extended, a magnet individual to each trunk for controlling the selection of said trunk, said magnet being provided with a plurality of armature's, one quickly responsive to the energization of said magnet and another slowly responsive to the energi'z'a'ti'oii of said magnet, a circuit closed upbn' the initiation oii a call on one of said lines. for energizing the magnet of the first idle triinli, said (in cuit being thereupon opened by said quickacting armature and subsequently extended by said slow-acting;- armature to the magnet of the next idle trunlc a 'holdi'rigi circuit for said magnet being closed by sa'id quick-acting armature and subsequently opened by said s'lovvacting'g armature, and at second holding circuit for said magnet and means for closing: said last-named holding circuit responsive to the ,enei'gizanon 011: said magnet;

12. In a telephone system, incoming lines, transfer circuits, an outgoing line having multiple contacts corresponding to said transfer circuits, separately movable switching mechanisms, incoming line magnets, outgoing line magnets, and means including a bar cooperating with said magnets to actuate and to maintain actuated a plurality of said switching mechanisms to extend said incoming lines through said transfer circuits to said outgoing line.

13. In a telephone system, incoming lines, groups of transfer circuits, outgoing lines, switching mechanisms, incoming line magnets, outgoing line magnets corresponding in number to the number of transfer circuits in a group, and means including a bar independent of said switching mechanisms cooperating with said magnets to actuate said mechanisms to extend said incoming lines through said transfer circuits tosaid outgoing lines, said bar also acting to maintain said mechanisms actuated throughout the connection.

14. In a telephone system, incoming lines, groups of transfer circuits outgoing lines, separately movable switching mechanisms, incoming line magnets, outgoing line magnets corresponding in number to the number of transfer circuits in a group, and means including a bar cooperating with said magnets to actuate a plurality of said switching mechanisms to extend said incoming lines through said transfer circuits to said outgoing line, said bar also acting to maintain said mechanisms actuated throughout the connection.

15. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to each of said transfer circuits for connecting them to said outgoing lines, magnets for said switching mechanisms, and means including bars for cooperating with said magnets to actuate a plurality of said switching mechanisms whereby said incoming lines may be extended through said transfer circuits to said outgoing lines, said bars also acting to maintain said mechanisms throughout the connection.

In witness whereof, I hereunto subscribe my name this 12th day of December A. DJ,

CHARLES L. GOODRUM. 

